One of the few Alien buildings, it can attack both ground units and aircraft. It can hold against most basic enemy units, but stronger units or long-range artillery can make short work of it.
An error in nucleus merging led to the creation of an immobile organism - but one that was armored in a fantastically tough, defensive shell. The Orchidian Nest became the Alien basic defense structure, having the ability to eliminate ground and airborne targets by ejecting acidic substances. It can transform into the Cactacian Nest and Droserian Nest forms.